My laptop screen is grey and won't change

Registration date
Monday September 21, 2015
Last seen
September 21, 2015
- Sep 21, 2015 at 01:25 AM
Hi all!
My dell Inspiron N5110 would start but the screen wont change from grey. If i switch it off for 4-5 hours and turn it on i cannot see the dell logo but after a minute the windows welcome screen appears and i can log into my account but after 5-10 minutes the screen goes grey on its own.

P.S. i tried pressing F2/F8 to go to the boot menu but it doesn't happen(even if it does i cannot see it because of the grey screen)

Please help!
Thanks in advance.